discard_iterator.h

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/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


#pragma once

#include <thrust/detail/config.h>
#include <thrust/iterator/detail/discard_iterator_base.h>
#include <thrust/iterator/iterator_facade.h>

THRUST_DISABLE_MSVC_POSSIBLE_LOSS_OF_DATA_WARNING_BEGIN

THRUST_NAMESPACE_BEGIN

template<typename System = use_default>
  class discard_iterator
    : public detail::discard_iterator_base<System>::type
{
    friend class thrust::iterator_core_access;
    typedef typename detail::discard_iterator_base<System>::type          super_t;
    typedef typename detail::discard_iterator_base<System>::incrementable incrementable;
    typedef typename detail::discard_iterator_base<System>::base_iterator base_iterator;

  public:
    typedef typename super_t::reference  reference;
    typedef typename super_t::value_type value_type;

    __host__ __device__
    discard_iterator(discard_iterator const &rhs)
      : super_t(rhs.base()) {}

#if THRUST_CPP_DIALECT >= 2011
    discard_iterator & operator=(const discard_iterator &) = default;
#endif

    __host__ __device__
    discard_iterator(incrementable const &i = incrementable())
      : super_t(base_iterator(i)) {}

  private: // Core iterator interface
    __host__ __device__
    reference dereference() const
    {
      return m_element;
    }

    mutable value_type m_element;

}; // end constant_iterator


inline __host__ __device__
discard_iterator<> make_discard_iterator(discard_iterator<>::difference_type i = discard_iterator<>::difference_type(0))
{
  return discard_iterator<>(i);
} // end make_discard_iterator()

THRUST_NAMESPACE_END

THRUST_DISABLE_MSVC_POSSIBLE_LOSS_OF_DATA_WARNING_END